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-'r H o M A s H. o L A R K, o Ej ,I N D I A'N A 1.) 01,18, INDIA'N'A Letters Patent No. 62,Q07,. clated February 12, 1867. i i i STEAM-BOILEB. PUB-NACE.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, THOMAS H-. CLAIK. of Indiunapolis, in the county, of' Marion, and State of Indiana,

have invented a new and improved Boiler Furnace; and I' do hereby declare that the following-is a full, clear,`

Smd exe'ct description'thereof, reference being had to the accompanying drswings,l forming part of this specification, in which the nature of this invehtion consists in causing the products of combustionl'to' be equally distribntedmnder the boilers set in arfurnace for the purpose ofgenerating steam, and in preventing them, when several boilers oa-,re set in an arch, from passing away diagonally from the boilers inost remote from the chimneys. -It also consists in supplyiug, by novel means, Oxygen to the furnace to fncilitate combustion, by which all the gascs are consumed and equally distributcd orer the fire surface of the boilers.

To ena'ole others skilled inthe art to make and use my invent'ion, I will proceed to describe its construc' tion and operation. i i

Figure 1 is a. front elevzttion, represented with three hoilers.

Figure 2 is a plan view of the same.

Figure 3 is a pcrspeetive view of the same, showing one of the sides of the furnace and back part, with a portion broken out.

` Figurc 4is a sectional elevntion from the line A B.

Fignre 5 is a. scctional elevation, the lsection taken from the line C 1).

Letters of like name and kind refer to like parts in each of the figures. i

A represents three boilers set side by side in a. furnace or brick-work, B. These boilers are of common con'- struction, and pi'ovidcd with fiues C O, and mzin-h'oles D, for the purpose of Cleaning the boilers. These boilers are set in such a manner as to leav'e flues E about sixiinches under the forward part of the boiler andabout 'eight inches more or'less'undcr the renr of the boiler.: The reas'on`fo r this is that the air and gnses are more expanded Vand. requirc more room; the form ofthc said iiues E being that of a. semcircle, whosc sides are concentric'with the sides of the boiler, and communicate witlreach other by reason of the intersection of their sides nt a. line about midway of the length of the boilers, their lines of intersection forming respctii/elythc top portion which is made between the lower part of the arljacent boiler. F represents :tir passages or'flues' madein the side'wlls of the furnace,- opening out in front for the purpose of admitting air. Thesefles F extend in the well back horizouta-lly alon'gside the'boiler and beyond where it cnters the outcr space or flue E. The object and purpose of these air flues are to admit coldiair, in order to keep the wnlls cool, and'to'suppl'y oxyg'en to the fire to facilitatc and perfect a, more complete combustion. H reprcscn ts air-tight' tubes built in the hrickwork underneath the boilcrs, and opening ou each side thereof, as shown in dotted lines in fig.`2. Branch tubes H', more or less under cech boiler, communicate withtthe tube 'H and fiue E. These branch tubes oxtend in an inclined dircctiou, as shown in figs. 4 and 5, and open into the fiue space E upon the inidc of the transi'erse channel I, which inters'ects the flue E just in renrof thel 'gratem The object of 'these brflnchtubes is `to supply air to aid inhconsuming the gnses from the buruingifuel. The slides E2, at the side of the opening Iz, are for the purpose of. regulcting the'supply of air. The flue E extends beyond the channels I, until they end at the space O, which serves usa general'fiue chamberfto receiye the remaining products-of coinibustion which yare then distributed to the return flues C, which pass longitudinally through theboilers in theXiisua-l wazy'until the are discharged from the upper return fluc into the smoke-Stack. Thechannels I tre proidcd with doors nt each end in the wall of thcfui'ntce, so that access maybe had itherein for the purposc of rcmoving the ashes` that may collect in the said chon-ncls.- A great advantage is'realized from the construction of t'his furnace from the fact thatthe heat a'rising from the products oficcmb'hst'ion is caused to move in a straight line with the several' b'oilers by the dividing ridges S which separate th flues E from each other end pr'events the heat from moving in a transverse direction with the hoilers. When 'the drlaught sets toward one side, ortoward any particular part of the furnace which may be ne'nrest the chimney, or most directly under the influence where such a. division of the smoke and goscs 'takesplace in n furnace wherev several boilers are set side by side, it is evident that`` the boiler nearest the stock, or which-lics in the pathor current of draught, receives a more intense :md Constant heat, and of course gcnerctes more steam than the other boilrs, and is burnt o ut and 'destroyed i `much sooncr than the rest. The ridges S, 'which separate the flues E from each other, are made of fire-brick. iron, or otherfiuitablematerich Hajving thus deserbed my invention, what I elaim asnew, and desire to secure by Letter Patent, is-

The combination of a boilor furnace, where one ormore boilers are rranged in thesam e longitncl'inal plane of the fiues E, made coneentric in the transverse section with the bottm of the boiler, nd which extend beeath the boilers in the direction of their length, and are 'separated from ech other byridges S, wlth the transverse Channels I, :md :tir Channels F and and the eontinuation of the partit-ion between the boilers over the chzunbers C', leving a space under the boilers, substantially and for the purposes as herein shown :md described. i THOMAS H. CLARK.

Witnesses: i v

CnAs. E: Swmmmn'r,

CnAnnEs WYLIE. 

